Since it was mentioned...the key to finally having my light turn on for modes was in arpeggios. I'm going really basic here, any corrections by those in the know, or suggestions to improve the practice, go nuts
Just in case you don't have this map - here be the major scale degrees, modes, and arpeggios:
deg - mode - arpeggio
---------------------
I --- ionian ---- Maj7
ii -- dorian ---- min7
iii --phrygian -- min7
IV - lydian ----- Maj7
V -- mixolydian - dominant
vi - aeolian ---- min7
VII - locrian ---- min7(b5)
It breaks down to only four arpeggios, due that we're now only concerned with half of the notes of the scale. Dorian and phrygian use the same min7 arpeggio even though they're mismatched on both the 2nd and 6th scale degrees; 1st 3rd 5th and 7th scale degrees are exactly the same. Yay, arpeggio!
So, now we got half the stuff to worry about. Since we tend to hang out with drummers a lot, this is a very good thing
EADG gave a great progression example, I'll dumb it down even further to a simple ii-V-I (V being dominant) in C Major jazz walker and add the arps:
Due that we're in C Major:
ii = Dm7 = D Dorian --- min7 (1 b3 5 b7)
V = G7 = G Mixolydian - 7 (1 3 5 b7 - dominant)
I = Cmaj7 = C Ionian - Maj7 (1 3 5 7)
As a very basic walking line, walk those arps ascending from their respective root notes.
Once you're comfy repeating the arpeggios, walk around with that ii-V-I as a backing track in your head, but just using the modes. Start walking with D dorian, all the way through. Then G Mixo. Then C Ionian. It's all the key of C Major, just with different root notes, so. Very yummy.
Then see what happens if you try to walk around in D aeolian over that I chord where the Dmin7 arpeggio worked so nicely. The first time that I spaced where I was, I hit the b6 due to forgetting I wasn't in D aeolian, and that's where it went "click" for me. I went "ohhhh...." then started happily running around the neck in D dorian.
Rest of these guys are going "duh" right now, but hey. It was a big thing for me
Anyways!
I jam along to midi files. In this case, if you don't have any...use the key of C one in "Major ii-V-I All 12 Keys.zip":
http://www.houstonbasslessons.com/play_alongs.html
I starting practicing this off the Dave Marks walking lessons (there be 9 of em, methinks):
http://www.youtube.com/watch?v=UZ7MfADYRmg
His website's down, and the PDFs are on there with arp shapes and such...so here's a link to a lesson PDF. Just change the number in the link for any others. The vids and PDFs are really, really nice so far for where I'm at. Basic, but smart.
http://www.davemarks.com/pdf.youtube....Walking01.pdf
Tip o' the iceberg, and just a baby step to start with, but. Hopefully this helps. Don't know if it's pretty, but it was the missing link for me. So far it's done wonders for clearing out unwanted boxes, opening options, and facilitating improv and solo ideas.
Hopefully this is a good route, 'cause I've been practicing the poop out of it
-tap